Patent GB-191122921-A (GB)
Title: Improvements in or relating to Calculating Machines.
Inventor: BAMLET WILLIAM HENRY
Filed: 1911-10-17
Granted: 1912-10-17
Abstract: 22,921. Bamlet, W. H., Box, A. E., and Williamson, F. Oct. 17. Adding and multiplying apparatus.-A keyset lever-operated calculating-machine, adapted to calculate, at given rates,.the dividend, tax, and net value of the dividend on stocks and shares and to totalize the same, is provided with means whereby the setting-up and totalizing of a plurality of digits in different denominations to represent the stock automatically sets the other mechanisms for recording and totalizing the predetermined ratios to the digits set up. The item of stock is set up by depressing s t o p - k e y s C ... C<3>, Fig. 5, and then pulling forward the setting-handles D ... D' which, by means of springs D<22>, co-operate with the stop-keys to limit the movements of the handles and the corresponding sector-pieces D<5> ... D<8>; the amount set is indicated un strips D<26> which are visible through apertures E ... E<3>. Rotatably mounted on the shaft D<4> is an arm O having a series of cam plates O<3> ... O<6> mounted thereon in the plane of the stop-keys, which keys, when depressed, are adapted to engage therewith. A pivoted member O<9>, Fig. 3, on the arm 0 is adapted to be engaged by a cam H<2> secured to the main spindle H', and is adapted to be raised to return the stop-keys to normal position, thereby releasing the sector pieces D<5> ... D<8>. These sectors are connected by tie-rods to three groups of sectors D<9> ... D<12>, D<13> ... D<16>, D<17> ... D<20> for the dividend, tax, and net-value calculations, and each sector has a toothed sector D<27> attached to it which gears with a spur wheel on a corresponding numeral or printing wheel. The fourth group of sectors D<27> is connected through intermediate gearing to the spur wheels. Operation and item counters. - An arm H<3> carrying a pivoted member H<4> engages the upper end of a lever H<5> when the main shaft is rotated in the direction of the arrow and rocks a pawl H<8> which actuates the ratchetwheel of a numbering-mechanism H". For the purpose of missing a number, the mechanism may be operated by a plunger H<12>. Printing-mechanism.-Items are printed from the item-wheels on shaft P and totals from the total-wheels on shaft K<1>. As the main shaft H<1> continues to rotate, the member H<4> rocks a lever F<9>, Fig. 3, and thereby rotates a shaft F<8> which raises a lever F<10> so as to lift a platen F<3> to cause a record of the items to be made on the paper strip F<2>. The paper is inserted through a slot F and is fed forward between rollers F<11>, F<12> rotated by means of a pawl F<17> attached to the lower end of a lever F<14> which is provided with a pivoted member F<16> adapted to engage a cam H<14> on the main spindle. The paper may also be fed by the rotation of a milled head, and the spacing is controlled by a roller F<21> engaging V-shaped notches in a wheel on the spindle of the roller F<11>. An inking-ribbon passes over spools Q and is advanced, by means of a pawl attached to the arm F<10>, when the arm is returning to normal position. The totals may be printed at any time by depressing a lever J to operate a platen J'. To bring the paper into the correct position for printing a total, it is moved back by partially rotating and pulling a milled roller G which causes links G<3> to rock so as to clamp the paper to side bars G<1> connected to said roller by a rod G<2>. To indicate the approach of the end of the paper, a roller N<4> which rests thereon is mounted on a rack N<3> and is adapted to be depressed to rotate a hammer N<7> to strike a gong when the end of the paper has passed the roller. At the same time, a rod N<9> pivoted to a lever N' is raised to prevent another sheet of paper being inserted until the total has been printed and the lever N<1> depressed. Transfer mechanism. - To effect a transfer between the item numeral wheels on the spindle P, a pin P<5> on the lower wheel, Fig. 8, moving in a slot in a fixed disk P<7>, is adapted to engage a projection on a pawl P<17>, Fig. 10, pivoted on an arm mounted on a plate P<8> fixed to the spindle. The pawl P<17> is moved into engagement with the ratchet-teeth of a ring P<11>, Fig. 9, secured to the next higher wheel, which is rotated thereby until a pin P<20> on the disk P<8> disengages the pawl. A modified arrangement of the transfer mechanism is described, in which, instead of the disks as P', P' being fixed, one is spring-controlled and mounted on a sleeve, and the pawl is always in engagement with the ratchet teeth. The advance of the higher wheel is effected by the pin of the lower wheel engaging a member on the movable disk and rotating it until the member can pass a projection on the fixed disk. Zeroizing-mechanism.-The item wheels, which are not secured to their spur wheels, are zeroized on the return movement of the operating-lever H by means of a sector P<33>, Fig. 3, which gears with a spur wheel P<34> loosely mounted on the shaft P and provided with a pawl P<35> which engages a ratchet-wheel P<36> fixed to the shaft. The shaft is thereby rotated, and spring- pressed plungers P<21>, Fig. 10, on the disks P<8> engage V-shaped teeth in a ring on the numeral wheels and rotate the wheels until the springs P<27> enter the slots P<26>, Fig. 11. Interlocking. - The item - wheel shaft P is locked during the setting of the item by means of a dog P" which has a tooth entering a notch in a disk P<40> mounted on the shaft. The dog is released near the end of the downward stroke of the operating-lever H by means of a pin P<41> on the sector P<33>, and is held out of engagement by a latch P<43> which is adapted to engage a pin on the dog P<37>. A cam portion P<44> engages the tail of the latch, and allows the dog to drop and lock the shaft P when the latter has returned to its normal position. Multiplying-apparatus. - It is necessary in machines as described to provide means whereby the item wheels of lowest denomination are always moved an amount to bring the type into line, such means being independent of the actuating-gear. This is effected by providing the numeral wheels with rings P<62>, P<63>, Figs. 17 and 19, the ring P<62> of which is movable against the action of a spring P<67>. Attached to the ring is a pin P<69>, Fig. 20, adapted to engage a pawl P" on the actuating spur wheel to advance said ring and thereby depress a member P<64>, Fig. 18, so as to release the ring P<63> and the numeral wheel, which will move forward the pitch of a tooth. This movement may be effected by a pawl P<17>, similar in arrangement to the transfer pawl described above, and in the zero position of the numeral wheel this pawl holds the ring P<62> so that it is moved forward a distance of half the pitch of a tooth against the spring P<67>. In certain calculations, it may be necessary to drive a numeral wheel by means of two spur wheels, in which case one spur wheel, as shown in Fig. 23, carries a pawl P<71> to drive the ring P<62> of the numeral wheel, and the spur wheel P", which is of lower order, carries pins P<75> to operate the transfer-like mechanism as described. In other calculations two spur wheels may drive the numeral wheel continuously, and, as shown in Fig. 25, the numeral wheel P<76> is driven by a spur wheel P<77> by means of a spring pawl and ratchetwheel P<80>, and also by means of a spur wheel P<78> through a plunger P<81> adapted to engage the crown ratchet teeth P<82>. The plunger P<81> is moved to drive the wheel when the pivoted lever P<83> thereof is moved from its cam pin P<87>. This arrangement allows the numeral wheel to be returned to zero after the spur wheels have been returned.